Two aeroplanes A and B, each moving with...

Two aeroplanes A and B, each moving with a speed of 720 km/hour, are moving directly away from each other. Aeroplane A emits a whistle of frequency 1080 Hz. The apparent frequency heard by a person in plane B will be (velocity of sound in air = `340 m//s`)

200 Hz

260 Hz

280 Hz

300 Hz

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TARGET PUBLICATION-Sound-Exercise

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